foolproof » fullproof

Plus, there’s no “if” about it…we’ve definitely executed innocent people. It would be impossible to have a 100% fullproof system. (link)

how on earth can you extract
information from somebody who maintains a poker face
throughout
the *entire* game? You can’t, this is precisely where
the use of
poker-faces lie. It’s fullproof if consistently
maintained and
this is precisely what these guys do… (link)

I should add that this program is not fullproof but has been working perfectly for me (link)

This classification method is however still being challenged, and does not seem to be fullproof. (link)

I usually forward the bill to the
vendor along with a form letter asking the vendor to contact the
publisher and make sure the billing address is the vendors and not ours.
However, it isn’t a long term solution since it does cost us postage and
is not fullproof. (link)